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x in (-oo:+oo)
5-(2*x) = 6*x+13 // - 6*x+13
5-(2*x)-(6*x)-13 = 0
5-2*x-6*x-13 = 0
-8*x-8 = 0 // + 8
-8*x = 8 // : -8
x = 8/(-8)
x = -1
x = -1
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